中国物理B ›› 2024, Vol. 33 ›› Issue (5): 58501-058501.doi: 10.1088/1674-1056/ad2bf7
Bo-Liang Liu(刘博梁)1,2, Dong Liu(刘冬)1,2,†, Ming Yao(姚明)1, Jun-Da Jin(金骏达)1, Zheng Wang(王争)1,2, Jing Li(李婧)1,2, Sheng-Cai Shi(史生才)1,2,‡, Artem Chekushkin3, Michael Fominsky3, Lyudmila Filippenko3, and Valery Koshelets3
Bo-Liang Liu(刘博梁)1,2, Dong Liu(刘冬)1,2,†, Ming Yao(姚明)1, Jun-Da Jin(金骏达)1, Zheng Wang(王争)1,2, Jing Li(李婧)1,2, Sheng-Cai Shi(史生才)1,2,‡, Artem Chekushkin3, Michael Fominsky3, Lyudmila Filippenko3, and Valery Koshelets3
摘要: The terahertz band, a unique segment of the electromagnetic spectrum, is crucial for observing the cold, dark universe and plays a pivotal role in cutting-edge scientific research, including the study of cosmic environments that support life and imaging black holes. High-sensitivity superconductor-insulator-superconductor (SIS) mixers are essential detectors for terahertz astronomical telescopes and interferometric arrays. Compared to the commonly used classical Nb/AlOx/Nb superconducting tunnel junction, the Nb/AlN/NbN hybrid superconducting tunnel junction has a higher energy gap voltage and can achieve a higher critical current density. This makes it particularly promising for the development of ultra-wideband, high-sensitivity coherent detectors or mixers in various scientific research fields. In this paper, we present a superconducting SIS mixer based on Nb/AlN/NbN parallel-connected twin junctions (PCTJ), which has a bandwidth extending up to 490 GHz-720 GHz. The best achieved double-sideband (DSB) noise temperature (sensitivity) is below three times the quantum noise level.
中图分类号: (Superconducting infrared, submillimeter and millimeter wave detectors)